We haven’t heard much about right-hander Jhoulys Chacin since he was released by the Rockies during spring training, but he’s back in the majors now as a member of the suddenly-relevant Diamondbacks and will start tonight against the Cardinals.

Chacin was a solid starter from 2010-2013, but he had a 5.40 ERA in 11 starts last season while dealing with shoulder issues and was cut loose by Colorado this spring after an awful showing during Cactus League action. The 27-year-old latched on with the Indians from there and posted a 3.21 ERA over seven starts at Triple-A Columbus before using an opt-out clause in his contract. He signed with the Diamondbacks two months ago and has posted a 3.39 ERA and 61/29 K/BB ratio in 79 2/3 innings over 12 starts.

The Diamondbacks will enter play tonight just five games back of the Dodgers in the NL West. According to Steve Gilbert of MLB.com, Chacin is pitching tonight to give the other starters an extra day of rest. Randall Delgado made a spot start over the on Saturday after Jeremy Hellickson landed on the disabled list with a hamstring injury, but Chacin could stick in the rotation if the Diamondbacks decide to move Delgado back to the bullpen.